Double-drum hoist



June 30, 1925.

E. B. LEAR DOUBLE DRUM HOIST Filed March 18. 1924 2 Sheets-Sheet 1 INVENTOR- EaflLB-Leav 13% HIS ATT I'R EY June 30, 1925.

E. B. LEAR DOUBLE DRUM HOIST Q Filed March 1 19'24 fil 4 v 2 Sheets-Sheet 73- INVENTOR .EauLB- dilemma Hi5 ATTb EY Patented June 30, 1925.

UNITED STATES PATENT OFFICE,

EARL B. LEAR, OF PHILLIPSBITRG, NEW JERSEY, ASSIGNOR TO INGERSOLL-RAND COM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DOUBLE-DRUM HOIST.

Application filed March 18, 1924. Serial No. 699,967.

I '0 all whom it may concern:

Be it known that I, EARL B. LEAR, a citizen of the United States, and a resident of Phillipsburg, county of Warren, and State of New Jersey, have invented a certain Double-Drum Hoist, of which the following is a specification, accompanied by drawings.

This invention relates to hoists, but more especially to a power driven hoist of the double drum type, in which either drum ma be driven from a common driving shaft. Such hoists shown for example, in U. S. Patent No. 1,421,183, granted June 27th,1922, to Jesse Ditson, are particularly useful for haulage purposes or in connection with other work in which the load is carried by cables, one of which is adapted to be wound upon the haulage or lifting drum as the other is unwound from the tail rope drum.

Similarly to the\ patent referred to, the objects of the present invention are to enable two drums, as for instance, a haulage drum and a tail rope drum, to be driven from a common source by improved means and devices, which automatically disconnect one drum and connect the other drum. to the driving shaft in accordance with the direction of rotation of the shaft.

In accordance with my invention, the opposed drivers carriedby the drums respectively are provided with ratchet faces and the main driver, which rotates ,with the driving shaft, carries a movable member for automatically connecting the main driver to one or the other of the opposed drivers in accordance with the direction of rotation of the driving shaft, but in addition to these elements, suitable means are provided, independent of the opposed drivers for actuating the movable member into engagement with one or the other of the opposed drivers. The movable member may be in the form of a pawl and is positively moved or rocked from one side to the other to engage one or the other of the opposed drivers in order to drive one or the other of the drums.

Further objects of the invention will hereinafter appear and to all of these ends the invention consists of the hoist. described and claimed in this specification and shown in taken on the line 2-2- of Figure 1 looking in the direction of the arrows,

Figure 3 is a detailed sectional view taken on the line 3-3 of Figure 2 looking in the direction of the arrows,

Figure 4 is a detailed section taken on the line t4 of Figure 2 looking in the direction of the arrows, and

Figure 5 is an enlarged perspective View of the pawl carrier and pawl.

Referring to the drawings, the base plate Aon which the hoist is mounted, is'shown connected to a swivel mounting B to enable the hoist to be rotatably adjusted to any desired position. Any suitable motor may be provided for the hoist and in this instance a fluid pressure motor is indicated, having a frame C connected to the base plate A by the cap bolts D and a casing E which is preferably connected to the frame 0 by the cap bolts F. Fluid pressure, as for instance compressed air, is supplied to the motor through a suitable inlet, (not shown) controlled by a suitable valve in the valve chest G adapted to be manipulated by the valve lever H. In this instance, the motor is assumed to be a reversible motor, the reversal of which is controlled by the valve lever H.

A center bearing J shown in this instance as a tubular support in the form of a shell, having a tubular body and a flanged portion K, in this instance forms a partof the frame C. The opposite end of the center bearing is supported in the gear box L which may be suitably secured to the base plate A. A

center bearing retaining screw 0 secures the center bearing to the inner wall of the gear box L and a gear box cover P is secured to the gear box by means of bolts Q. The construction of the motor and frame so far described, has a minimum number of parts, is strong and compact, easily assembled and disassembled, and permits ready accessibility to the operative parts of the hoist.

A main driving shaft R passing longitudinally through the center bearing J is supported in the bearings S and T and is connected to be rotated by the motor in any suitable manner. A driving pinion U is preferably keyed to the driving shaft R and meshes with an intermediate gear V journaled on the counter shaft W mounted in the gear box cover P. The intermediate gear V is provided with bearings X and Y and an intermediate pinion Z in this instance forming a portion of the intermediate gear V, meshes with the internal gear a of the driver 6 preferably in the form of a hollow rotatable shaft adapted to rotate on the center bearing J from which driving power is taken for driving either one of the two drums 0 and (i loosely mounted relative to the driver or rotatable shaft 1) and ro tatable about the driving shaft B. It will thus be seen that the driver I) is connected as by means of gearing to the main driving shaft R. In this instance also, one of the drums is conveniently )journaled on the center bearing J.

The tail rope drum J to which the tail rope e is adapted to be. connected rotates preferably upon the center bearing J and the haulage rope drum 0, mounted beside the drum d in line therewith and to which the haulage rope f is connected preferably rotates upon the driver I) as a convenient and compact construction. Such construction of the drums materially reduces the over-all length of the hoist and produces a W compact and well balanced hoist.

Means are provided for automatically connecting the driver b to one or the other of the drums 0 and (Z in accordance with the direction of rotation of the driving shaft R and for this purpose the tail rope drum d is provided with a driver 9 preferably in the form of an annular ring or plate having clutch members in the form of teeth h merging into' cam surfaces j. The tail rope drum driver 9 is suitably secured to the tail rope drum by means of rivets 7c.

The haulage rope drum 0 is likewise provided with a driver 0 and also is preferably in the form of an annular ring or plate having clutch members on its face in the form of teeth ;0 likewise merging into cam surfaces. The haulage drum driver 0 is secured to the haulage drum 0 by means of rivets q.

A main driver for connecting the driver 6 to one or the other of the drums c and d in this instance comprises an annular ring or plate r which is preferably keyed to the driver?) and a pawl carrier 8 which preferably s'urrounds the annular ring r. The pawl carrier 8 is preferably formed in two sections and each section is provided with 2. lug t at the opposite ends. A pawl s is pivotally mounted on a bolt 11 which clamps the sections of the carrier together and is held in place by a nut "u. A bushing w may be mounted en the boit a and spaces the sections of the carrier .9. The pawl s is adapted to rock between the drum drivers f] and 0 according to the direction of rotation of the driving shaft R and consequent rotation of the driver 5.

In order to rock the pawl 8 into engage ment with one or the other of the drum drivers, the annular ring is formed with spiralled teeth 00 and the pawl s is formed with spiralled teeth oppositely inclined from the teeth :1: so that as the driver 6 is rotated, the annular ring 1' will accordingly be rotated and by holding the pawl carrier 8 stationary relative to the annular ring 1' momentarily and permitting a limited rotative movement of the ring 7* relative to the pawl, carrier 8 the teeth w on the ring 1' will move the pawl 8' into engagement with a tooth on one or the other of the drum drivers 9 and 0 in accordance with the direction of rotation of the driving shaft R.

In order to enable the pawl carrier 8 and the annular ring r to have a relative limited rotative movement, grooves e are preferably formed on the outer periphery of the an nular plate a" and grooves 2 are preferably formed on the inner surface of the pawl carrier 8 which are adapted to register with the grooves 2. Pins 3 having heads 4 are adapted to'lie in the grooves 2 and z and serve as stops for limiting the relative rotative movement between the annular ring r and the pawl carrier 8.

In order to hold the pawl carriers stationary momentarily relative to the annular ring 7* suitable means are provided on the pawl carriers and in this instance a pair of plungers 5 are preferably mounted in projections 6 on the pawl carrier 8 and are forced in opposite directions by a coil spring 7 so that one of the plungers is adapted to frictionally engage the drum driver 9 and the other plunger is adapted to frictionally engage the drum driver 0. The number of these sets of plungers and the number of pawls carried by the pawl carrier 8 may be varied as desired. The oppositely spiralled teeth as and 3 constitutemeans inde )endent of the ratchet faces or teeth h. an p of the opposed drivers for positively actuating the pawls into engagement with one or the other of the opposed drivers, although it is not to be understood that this invention is limited to the construction shown since other equivalent means could be provided for actuating the pawls within the scope of my invention as defined in the claims appended hereto.

In the eperation of the hoist so far, described. if it be assumed that the annular ring r is rotated in the direction of the ar row 8 in Figure 2 through the train of gearing described, the plungers 5 will be forced into frictional engagement with the drum drivers 9 and 0 and tend to hold the pawl carrier a stationary relative to the annular ring 1'. The annular ring f wi l then rotate relative to the pawl carrier 8 through the limited space as defined by the grooves 2 and z and the spiralled'teeth x on the annular ring 1" will cooperate with the oppositely spiralled teeth 1 on the pawl s and move the pawl into engagement with the teeth 71 and the drum driver 9'.

. The pawl s will thus be brought into engagement with the teethon one or the other of the drum drivers 9 and 0 in accordance with the direction of rotation of the driving shaft R and by permitting limited rotative movement between the pawl carrier 8 and the annular ring 1', the pawl s will be moved against the teeth of one or the other of the opposed drum drivers before the annular plate and pawl carrier rotate as a unit so that longitudinal thrust against one orthe other of the drums is eliminated. Whenever one of the drum drivers 9 and 0 is engaged by the pawl s, in order to drive one or the other of the drums 0 and d, the other drum can rotate independently of the driven drum about the driving shaft R.

In a hoist of the character described, a brake should be provided for one of the drums, and although it is unnecesary to provide a brake for both drums, in some instances two brakes may be preferable, and a brake is shown for each drum. In this instance, the haulage drum'c is provided with a flange '9 to which a brake band 10 having a suitable lining 12 is applied. A' brake lever 13 is fulcrumed on the base A, at 14, and any suitable mechanical connection, not indicated in detail, may be provided between] the brake lever 13 and the brake band 10 for tightening and loosening the brake. Similarly a brake band 15 having a suitable lining 16 may be applied to the flange 17 of the tail rope drum d and suitably connected to be operated by the brake lever 18.

I claim:

'1. Ina-hoist, the combination of" a frame, a driving shaft, two drums rotatable about the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver including a pawl carrier and a ring connected to be rotated by the driving shaft, a pawl pivoted to the main driver for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, and means independent of the opposed drivers for rocking said pawl about its pivot into engagement with one orthe other of said opposed drivers.

2. In a hoist, the combination of a "frame, a driving shaft, two drums rotatable about the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by the said drums respectively, a main driver connected to be rotated by the driving shaft comprising a ring and a pawl carmeans independent of the opposed driversfor actuating said pawl into engagement with one or the other of said opposed drivers.

3. In a hoist, the combination of a frame,

a driving shaft, two drums rotatable about the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by the said drums respectively, a main driver connected to be rotated by the driving shaft comprising a ring and a pawl car- .rier, means for permitting limited rotative movement between said ring and pawl carrier, a rocking pawl carried by'said pawl carrier for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, means independent of the opposed drivers for actuating said pawl into engagement with one or the other of said opposed drivers, and frictional means tending to hold said pawl carrier stationary relative to said ring upon the reversal of the direction of rotation of the motor.

4. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about the driving shaft, a motor connected to op erate the driving shaft, opposed drivers car: ried by said drums respectively, a main driver connected to be rotated by the driving shaft comprising a ring and a pawl car rier, said ring and pawl carrier being formed with grooves in registration with each other, a pin in said ooves whereby said awl carrier is adapte to have limited rotatlve movement relative to said ring, a pawl carried by said pawl carrier for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, and means independent of the opposed drivers for actuating the said pawl into engagement with one or the other of said opposed drivers.

5. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about the driving shaft, a motor connected to operate the drivin shaft, opposed drivers carried by said drums respectively, a main driver connected to be rotated by the driving shaft comprising 'a ring and a pawl carrier, said ring and pawl carrier being formed with grooves in registration with .eacclli other, a pin in said grooves whereby sai pawl carried by said pawl carrier for autoawl carrier is adapted to have limited rotative movement relative to said ring, a

matically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, means independent of the opposed drivers for actuating the said pawl into engagement with one or' the other of said opposed drivers, and spring pressed plungers adapted to frictionally engage said drums tending to hold said pawl carrier stationary relative to said ring upon the reversal of the direction of rotation of the motor.

6. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about the driving shaft, a motor connected to operate the driving shaft, opposed drivers car ried by the said drums respectively, a main driver including a pawl carrier and a ring connected to be rotated by the driving shaft, a pawl carried by the main driver for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, andmeans including oppositely spiralled teeth on said pawl and a portion of said main driver for actuating said pawl into engagement with one or the other of said opposed drivers. v

In testimony whereof I have signed this specification.

EARL B. LEAR. 

